Tkander



J. F, OSTRANDER.

Grain Mill. I

Patentd Apri'f25,1s46.

TTEI) STATES PATENT OFFICE.

J. F. OSTRANDER, OF NEW YORK, N. Y.

GRINDING-MILL.

Specification of Letters Patent No. 4,478, dated April 25, 1846.

To all whom it may concern:

Be it known that I, JONATHAN F. Os- TRANDER, of the city of New York, inthe State of New York, have invented a certain new and usefulImprovement in Mills; and I do hereby declare that the following is afull, clear, and exact description thereof.

The nature of my invention consists in making the surfaces of thestones, or metallic plates, between which the material is ground, theone convex and the other concavethe convexity and concavity beinghemispherical, or of the form of spherical segments; and also in givingthe movable plate, or stove, a compound motion, consisting of, firstly,an oblique gyrating motion of its axis around the axis of the fixedplate, and, secondly, a rotating motion around its own axis. Thesemotions will be more fully understood from the following description ofa mill for grinding paint and other substances. In this mill thestationary part is a truncated sphere of metal, consisting of more thana hemisphere: it is fastened firmly upon the platform of a frame ofwood, or iron, by a pin passing through the platform and secured uponthe under side by a nut its position is such that the flat side restsupon the platform, leaving the hemisphere opposite projecting upward. Inorder to give a clearer idea of the construction and operation of themill it will be necessary to consider this truncated sphere as having anaxis, and that the axis is perpendicular to the plane, or truncated,side and, conse quently, in a vertical position. The movable part of themill is a hollow hemisphere, which, for distinction, I shall call theshell: it rests upon and incloses the hemisphere of the stationary partand it is between the surfaces thus in contact that the paint is ground.The upper part of the shell is provided with an opening of a cup orfunnel shape through which the paint is fed to the mill. The surface ofthe hemisphere is cut into furrows, circular and concentric with theaxis, or like parallels of latitude upon a geographical globe, and 2 or3 cross furrows are cut in it, beginning at the pole and extendingpartly down the sides of the hemisphere, for the better distributing ofthe paint over the grinding surfaces; the interior of the shell is alsocut into furrows, circular and concentric with the axis when speaking ofthe axis of the shell I mean a semidiameter which is perpendicular tothe plane formed by the base of the shell. Motion is imparted to theshell through a rod, or handle, which surmounts it and extends upward inthe direction of its axis; the upper end of the handle passes through ahole in the end of a short arm extending at a right angle from anupright shaft; this shaft also carries a bevel wheel, into which gearsanother wheel carried by, a horizontal shaft, and this latter shaftterminates in a winch, 0r crank, to which the power is applied. Bothshafts work in bearings attached to the frame of the mill. The uprightshaft coincides exactly with the axis of the stationary hemisphere,hence, when the handle of the shell is inserted in the arm extendingfrom the shaft, as described, the shell will'be thrown off of itscenter, so to speak, or its axis will not coincide with the axis of thestationary hemisphere but will be oblique to it, and when the uprightshaft is made to revolve it will give the handle, and of course the axisof the shell, an oblique gyrating motion around the axis of thestationary hemisphere; and there will also be given to the shell arotating motion around its own axis-this latter motion resulting fromthe former one and from the pressure of the shell upon the stationaryhemisphere conjointly.

The paint is fed to the mill by being placed in the cup shaped openingin the top of the shell, before described, and the ground paint isreceived in a gutter surrounding the base of the stationary hemisphere.When the mill is used to grind dry substances it is furnished with ahopper. hung to the frame by hinges: the material is put into the hopperand from thence fed to the mill by a gutter leading to the opening inthe top of the shell.

Description of drawings hereto annexed, illustrating my invention, andforming part of this specification.

Figure I side elevation of a mill for grinding paint and othersubstances. Fig. II sectional elevation of the millthrough the line A,B. Fig. III top View of the stationary hemisphere. Fig. IV side view ofa section of the shell through the center.

A frame of wood to which the several parts of the mill are attached. Bplatform upon which the truncated sphere, or stationary part of themill, rests. C gutter surrounding the base of the truncated sphere andterminating in a spout (a) to lead away the contents of the gutter. Dthe truncated sphere, from which a bolt passes through the platform andis secured on the under side by a nut ((Z). The surface of the sphericalpart is cut into furrows (a) circular and concentric with the axis, andthose are crossed by three furrows (y) beginning at the crown of thehemisphere and extending a short distance down the sides. E the shell,or hollow hemisphere, forming the movable part of the mill. It isprovided with a funnel shaped opening (e) at the top through which thepaint is fed to the mill, and with a handle (6) by which motion isimparted to it. The interior surface is cut into furrows circular andconcentric with the axis. F an upright shaft which carries at its lowerend an arm (f) through a hole in which the handle of the shell passes,the hole being sufliciently large for the handle to play freely withinit. The shaft also carries a bevel wheel (f) through which it derivesmotion. G a horizontal shaft carrying at one end a bevel wheel (g) whichgears into the wheel upon the upright shaft; and provided at the otherend with a winch (g) to which the power for operating the mill isapplied. H bearings in which the shafts work. I a hopper with which themill is provided when it is used to grind any substances. The materialis fed to the mill by a gutter leading from the hopper to the opening inthe top of the shell.

What I claim as my invention and desire to secure by Letters Patent isThe making of the surfaces of the stones, or metallic plates, betweenwhich the material is ground, the one convex and the other concavetheconvexity and concavity being hemispherical or of the form of sphericalsegments and givingv the movable plate, or stone, a compound movementconsistingof the following motions viz. an oblique gyrating motion ofits axis around the axis of the fixed plate, and of a rotating motionaround its own axis, substantially as herein described, the wholeforming a mill for grinding paint, grain, &c.

JONATHAN F. OSTRANDER.

Witnesses:

G120. D. BALDWIN, P. F. STIRLING.

